Process of manufacturing composition boards.



UNITED STATES PATENT OFFICE.

JOHANN FERLA, OF ST. GEORGE, NEW YORKSSIGNOR 0F ONE-FOURTH TO CHARLES L.PARMELEE, OF GRA on, NEW JERSEY.

PROCESS OF MANUFACTURING COMPOSITION BOARDS.

No Drawing. Application filed September 8, 1906, Serial No. 333,804.Renewed April 1, 1908. Serial No. 424,537.

T 0 all whom it may concern:

Be it known that l, JOIIANN room, a eitizen of Switzerland, residing atSt. George, county of Richmond, New York, have invented new and usefulImprovements in Processes of lilanufacturing (kmiposition Boards, ofwhich the following is a specification.

This invention relates to improvements in processes of manufacturingcomposition boards, and it has for its object the provision of animproved process whereby composition boards of great strength anddurability may be economically produced from a mixture of hydrauliccement, asbestos and other ingredients.

In practicing the process, the ingredients preferably employed arehydraulic cement,

hemp, asbestos, acetic acid, liquid glue and factorin matter, ifdesired. The asbestos and hemp are first cut and crushed into very smalland fine pieces, almost to a powder, these operations being preferablyperformed b means of a special cutting machine and right and leftrevolving crusher. The materials are then elevated, preferably bysuction, to a storage room or bin. The finely cut and crushed asbestosand hemp are then mixed in the dry state with cement and coloring matterby any suitable mixing apparatus, such as a rotary mixer or revolvingkettle. The dry mixtureis then transferred to ipo thermixin machine,where tnaneeesi s ar quantlities 'o'" acetic acid, liquid glue andwatef'are added. At this stageftl'i'ei'iiixture is a pasty mass which isthen transferred to a large tank provided with an agitator to preventthe material from settling or hardening. From this tank the paste iscarried by a conveyor to a canal where water is added in sufficientquantity to make the mixture flow freely, and from the canal the thinaste flows into tanks of different sizes provided with automatic outletseach adapted to permit the paste to flow from the tank in precisely theproper quantity for the production of composition board of a certainthickness. All of these tanks discharge u on a travelin web or screen,preferably 0 wire-cloth, wl ich permits the bulk of the water in themixture to drain off. From this web or screen the material passes to anendless strip of felt running between adj ustable rollers which serve togage thickness of Specification of Letters Patent.

Patented Nov. 16, 1909.

the composition board with accuracy. felt absorbs a certain portion ofthe water remaining in the mixture and while traveling upon the felt thematerial hardens sullieiently to be cut as it leaves the felt intopieces of any desired dimensions. The pieces tion is carried on in ahermetiwilly closed chamber connected at top and bottom with suctionpumps. The suction pump at the top exhausts the air from the chamber andthe material and the other at the bottom of the chamber removes thewater from the material, thus supplementing t'h action of the press inproducing a thoroughly homogeneous material entirely free from air-holesor pores. After the pressing operation the ma tcrial is still somewhatplastic and may be pressed by suitable dies into any ornamental designor shape or may be readily cut into ornamental patterns by suitablecutting zipparatus.

Before the material is ready for use it should be allowed to harden orset for seventy-two hours after leaving the presses and then should bedipped for a few seconds into water and allowed to dry off. The materialis then ready for use and is characterized by great strength, firmnessand solidity, but is susceptible of working with ordinary wood-workingtools and is entirely free from warping. It is also fire-, acidandwaterproof and is excellent material for insulating electricalconductors.

Having thus described my lI1V8IllZlOl1,Wl1fl-ll I claim as new anddesire to secure by Letters Patent is:

The 55 The layers of material are sepa 65 1. The process of producingcomposition boards consisting in first mixing hydraulic cement andfibrous material in the dry state, and then adding to the dry mixtureglue, an acid solvent for glue and water in sufficient quantity to makethe material flow readily,

next forming layers from the mixture, then pressing the layers andfinally allowing the pressed layers to set or harden.

.mixture, pressing the layers and allowing them to set or harden.

ll. The process of producing composition boards which consists informing a mixture containiir; mineral fiber, hydraulic ren'ient andwater in sutlicient quantity to make the mixture flow freely, fOlITJlllga layer of the mixture, draining the excess of liquid from the layer,pressing the layer in a vacuum and allowing it to harden.

4, The process of producing composition boards consisting in forming amixture containing mineral fiber, hydraulic cement and water insufiicient quantity to make the mixture liow freely, flowing then'iixture on a moving perforated screen in a layer to permit the excesswater to drain oil", pressing the layer in a vacuum and allowing it toset or harden.

5. The process of producing cmnposition hoards consisting in firstmaking a mixture containing mineral fiber, hydraulic cement and water insufficient. quantity to make the mixture flow freely, flowing themixture on a moving screen in a layer to allow the excess of water todrain off, piling a plurality of the layers of material in a press withinterposed pieces of sheet metal, pressing the layers in a vacuum, andfinally allowing the material to set or harden.

6. The process of producing composition boards consisting of mixingasbestos, hemp, hydraulic cement, acetic acid, glue and water insufficient quantity to make the mixture flow freely, flowing the mixtureon a moving perforated screen in a layer, pressing the ayer in a vacuumand allowing it to set or harden.

7. The process of producing composition boards, consisting of firstmixing; asbestos, hemp, acetic acid, hydraulic cement, glue andsullicient ater to make the mixture llow l'reely, forming; a layer fromthe mix ture and draining the water therefrom, sub jet-tine the layer topressure in a hermet ically sealed chamber and simultaneouslyprt'nlucing a vacuum in said chamber by suclion pumps connected with thechamber at both top and bottom, and finally allowing the material to setor harden.

8. The process of ')roducing composition hoards consisting in mixingasbestos, hemp, cement, acetic acid, glue and water in sufii cientquantity to make the mixture flow freely, forming layers of materialfromthe mixture, piling the layers so formed in a. press with interposedpieces of sheet metal, pressing the layers in a hermetically closedchamber and simultaneously producing a \lwlll said chamber by n'ieans ofpumps con ected with. the chamber at the top and bottom, and finallyallowing the material to set or harden.

9. The process of producing composition boards consisting in mixingfibrous material, hydraulic cement, acetic acid, glue and water, forminga layer of the material, pressing the layer, allowing it to set orharden, then dipping it in Water for a few moments and allowing it todry.

In testimony whereof, I have signed. my name in the presence of twowitnesses.

itnesses:

WM. BRADFORD, Gnimnrr GANNoN.

